1728697 has 2 divisors, whose sum is σ = 1728698. Its totient is φ = 1728696.

The previous prime is 1728691. The next prime is 1728733. The reversal of 1728697 is 7968271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1610361 + 118336 = 1269^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728697 - 2³ = 1728689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864348 + 864349.

It is an arithmetic number, because the mean of its divisors is an integer number (864349).

2^1728697 is an apocalyptic number.

It is an amenable number.

1728697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728697 is an equidigital number, since it uses as much as digits as its factorization.

1728697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 1728697 is about 1314.7992242164. The cubic root of 1728697 is about 120.0161320905.

The spelling of 1728697 in words is "one million, seven hundred twenty-eight thousand, six hundred ninety-seven".